Помогите решить, избежать повторений

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        ArrayList<String> words = new ArrayList<String>();
        for (int i = 0; i < 4; i++) {
            words.add(reader.readLine());
        }

        Map<String, Integer> map = countWords(words);

        for (Map.Entry<String, Integer> pair : map.entrySet()) {
            System.out.println(pair.getKey() + " " + pair.getValue());
        }
    }

    public static Map<String, Integer> countWords(ArrayList<String> list) {
        int count = 0;

        HashMap<String, Integer> result = new HashMap<String, Integer>();
        for (int i = 0; i < list.size(); i ++){
            for (int j = 1; j < list.size(); j++) {
                if (list.get(i).equals(list.get(j))) {
                    count++;


                }



            }